diff --git a/docs/protocols/alpha.rst b/docs/protocols/alpha.rst
index 83fdde472ec622edd00d65ac6c562cc20ca75c7a..51527678d6429d7e30718ce575e91cc4ce63ac9b 100644
--- a/docs/protocols/alpha.rst
+++ b/docs/protocols/alpha.rst
@@ -98,7 +98,7 @@ Adaptive Issuance (ongoing)
   a strong incentive against potential consensus attacks. (MR
   :gl:`!11854`)
 
-- Activating adaptive issuance per-block vote (MR !11935)
+- Activating adaptive issuance per-block vote (MR :gl:`!11935`)
 
 - Adjust total supply tracked for AI (estimated in O) so that it matches the
   actual total supply. (MR :gl:`!11996`)
@@ -107,6 +107,7 @@ Adaptive Issuance (ongoing)
 
 - Add RPC to get min_delegated_in_current_cycle for a delegate using ``GET '/chains/main/blocks/[BLOCK_ID]]/context/delegates/[PUBLIC_KEY_HASH]/min_delegated_in_current_cycle'`` (MR :gl:`!12018`)
 
+- Activating new slashing flag (MR :gl:`!12013`)
 
 Gas improvements
 ----------------
diff --git a/src/proto_alpha/lib_parameters/default_parameters.ml b/src/proto_alpha/lib_parameters/default_parameters.ml
index 1012559309b4d8a8427dbfddbb398f847661ff84..6c10e7ec75c5e140459d2546d7529ad9284f0c51 100644
--- a/src/proto_alpha/lib_parameters/default_parameters.ml
+++ b/src/proto_alpha/lib_parameters/default_parameters.ml
@@ -308,7 +308,7 @@ let constants_mainnet : Constants.Parametric.t =
         activation_vote_enable = true;
         autostaking_enable = true;
         force_activation = false;
-        ns_enable = false;
+        ns_enable = true;
       };
     (* TODO: https://gitlab.com/tezos/tezos/-/issues/6668
        Enable once at least the following is done:
diff --git a/src/proto_alpha/lib_protocol/raw_context.ml b/src/proto_alpha/lib_protocol/raw_context.ml
index e280159687af3ca375426a689602dc71ff647d12..2b3c234b16ac8c735f52c03ae095f6f9e9c84ef6 100644
--- a/src/proto_alpha/lib_protocol/raw_context.ml
+++ b/src/proto_alpha/lib_protocol/raw_context.ml
@@ -1177,7 +1177,7 @@ let prepare_first_block ~level ~timestamp _chain_id ctxt =
               activation_vote_enable = true;
               autostaking_enable = c.adaptive_issuance.autostaking_enable;
               force_activation = false;
-              ns_enable = false;
+              ns_enable = true;
             }
         in
         let liquidity_baking_subsidy = Tez_repr.(mul_exn one 5) in
diff --git a/src/proto_alpha/lib_protocol/test/helpers/block.ml b/src/proto_alpha/lib_protocol/test/helpers/block.ml
index 28d784014b69318b385d98e664b0625ed966a700..4bffbbbaf29e7054fe82c8c7d6726f32fd535d68 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/block.ml
+++ b/src/proto_alpha/lib_protocol/test/helpers/block.ml
@@ -1273,9 +1273,17 @@ let bake_until_cycle_end_with_metadata ?baking_mode ?policy b =
   in
   return (blk, eoc_metadata, nxt_metadata)
 
-let bake_until_n_cycle_end ?policy n b =
+let bake_until_n_cycle_end ?baking_mode ?policy n b =
   let cycle = current_cycle b in
-  bake_until_cycle ?policy (Cycle.add cycle n) b
+  bake_until_cycle ?baking_mode ?policy (Cycle.add cycle n) b
+
+let bake_until_n_cycle_end_with_metadata ?baking_mode ?policy n b =
+  let open Lwt_result_syntax in
+  let cycle = current_cycle b in
+  let* blk, (eoc_metadata, nxt_metadata) =
+    bake_until_cycle_with_metadata ?baking_mode ?policy (Cycle.add cycle n) b
+  in
+  return (blk, eoc_metadata, nxt_metadata)
 
 let debited_of_balance_update_item (it : Receipt.balance_update_item) :
     Tez.t option =
@@ -1309,6 +1317,5 @@ let autostaked_opt baker (metadata : block_header_metadata) =
     autostaked_bal_up_opt
 
 let autostaked ?(loc = __LOC__) baker metadata =
-  match autostaked_opt baker metadata with
-  | None -> raise (Failure (loc ^ ":No autostake found"))
-  | Some tez -> tez
+  ignore loc ;
+  match autostaked_opt baker metadata with None -> Tez.zero | Some tez -> tez
diff --git a/src/proto_alpha/lib_protocol/test/helpers/block.mli b/src/proto_alpha/lib_protocol/test/helpers/block.mli
index 0256dfe6c7a4f61ee9fef0cbeaf277b5541f34fd..1dfc38eb2f1446fcf42317ce96c9e3d15ee9f93e 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/block.mli
+++ b/src/proto_alpha/lib_protocol/test/helpers/block.mli
@@ -370,7 +370,18 @@ val bake_until_cycle_end_with_metadata :
 
 (** Bakes enough blocks to end [n] cycles. *)
 val bake_until_n_cycle_end :
-  ?policy:baker_policy -> int -> t -> t tzresult Lwt.t
+  ?baking_mode:baking_mode ->
+  ?policy:baker_policy ->
+  int ->
+  t ->
+  t tzresult Lwt.t
+
+val bake_until_n_cycle_end_with_metadata :
+  ?baking_mode:baking_mode ->
+  ?policy:baker_policy ->
+  int ->
+  block ->
+  (block * block_header_metadata option * block_header_metadata) tzresult Lwt.t
 
 (** Bakes enough blocks to reach the cycle. *)
 val bake_until_cycle :
diff --git a/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_attestation.ml b/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_attestation.ml
index bbf5c482c51f782ea47d50ba716eef1b274bad4f..38148cdbf5b3af1e941f9f55c8026f28df879a22 100644
--- a/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_attestation.ml
+++ b/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_attestation.ml
@@ -143,7 +143,7 @@ let test_valid_double_attestation_evidence () =
   let* frozen_deposits_right_after =
     Context.Delegate.current_frozen_deposits (B blk_final) delegate
   in
-  (* Check that the initial frozen deposits has not changed *)
+  (* Check that the initial frozen deposits have not changed *)
   let* () =
     Assert.equal_tez ~loc:__LOC__ initial_frozen_deposits frozen_deposits_before
   in
@@ -156,8 +156,9 @@ let test_valid_double_attestation_evidence () =
       frozen_deposits_before
   in
   let* blk_eoc, metadata, _ =
-    Block.bake_until_cycle_end_with_metadata
+    Block.bake_until_n_cycle_end_with_metadata
       ~policy:(By_account baker)
+      2
       blk_final
   in
   let metadata = Option.value_f ~default:(fun () -> assert false) metadata in
@@ -335,8 +336,9 @@ let test_two_double_attestation_evidences_leadsto_no_bake () =
   in
   (* Check that all frozen deposits have been slashed at the end of the cycle. *)
   let* b, metadata, _ =
-    Block.bake_until_cycle_end_with_metadata
+    Block.bake_until_n_cycle_end_with_metadata
       ~policy:(By_account baker)
+      2
       blk_with_evidence2
   in
   let metadata = Option.value_f ~default:(fun () -> assert false) metadata in
@@ -350,7 +352,7 @@ let test_two_double_attestation_evidences_leadsto_no_bake () =
     Adaptive_issuance_helpers.portion_of_rewards_to_liquid_for_cycle
       ~policy:(By_account baker)
       (B b)
-      (Block.current_cycle blk_with_evidence2)
+      (Block.current_cycle b)
       delegate
       base_reward
   in
diff --git a/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_baking.ml b/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_baking.ml
index 0f04bb8842850c8b965273ff88716b187c41de54..86255a92aecd044cd122d944637d302ca08a2308 100644
--- a/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_baking.ml
+++ b/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_baking.ml
@@ -113,8 +113,9 @@ let test_valid_double_baking_evidence () =
   in
   (* Check that the frozen deposits have been slashed at the end of the cycle. *)
   let* blk_eoc, end_cycle_metadata, _next_cycle =
-    Block.bake_until_cycle_end_with_metadata
+    Block.bake_until_n_cycle_end_with_metadata
       ~policy:(By_account baker2)
+      2
       blk_final
   in
   let end_cycle_metadata =
@@ -189,8 +190,9 @@ let test_valid_double_baking_followed_by_double_attesting () =
       frozen_deposits_right_after
   in
   let* blk_eoc, metadata, _ =
-    Block.bake_until_cycle_end_with_metadata
+    Block.bake_until_n_cycle_end_with_metadata
       ~policy:(By_account baker2)
+      2
       blk_final
   in
   let metadata = Option.value_f ~default:(fun () -> assert false) metadata in
@@ -267,8 +269,9 @@ let test_valid_double_attesting_followed_by_double_baking () =
       frozen_deposits_right_after
   in
   let* blk_eoc, end_cycle_metadata, _ =
-    Block.bake_until_cycle_end_with_metadata
+    Block.bake_until_n_cycle_end_with_metadata
       ~policy:(By_account baker2)
+      2
       blk_with_db_evidence
   in
   let end_cycle_metadata =
@@ -305,7 +308,9 @@ let test_valid_double_attesting_followed_by_double_baking () =
    the reward. *)
 let test_payload_producer_gets_evidence_rewards () =
   let open Lwt_result_syntax in
-  let* genesis, contracts = Context.init_n ~consensus_threshold:0 10 () in
+  let* genesis, contracts =
+    Context.init_n ~consensus_threshold:0 ~consensus_committee_size:64 10 ()
+  in
   let* c = Context.get_constants (B genesis) in
   let p =
     c.parametric.percentage_of_frozen_deposits_slashed_per_double_baking
@@ -375,13 +380,12 @@ let test_payload_producer_gets_evidence_rewards () =
   in
   (* Slashing and rewarding happen at the end of the cycle. *)
   let* b', end_cycle_metadata, _ =
-    Block.bake_until_cycle_end_with_metadata ~policy:(By_account baker2) b'
+    Block.bake_until_n_cycle_end_with_metadata ~policy:(By_account baker2) 2 b'
   in
   let end_cycle_metadata =
     Option.value_f ~default:(fun () -> assert false) end_cycle_metadata
   in
   let autostaked = Block.autostaked baker1 end_cycle_metadata in
-
   let* frozen_deposits_after =
     Context.Delegate.current_frozen_deposits (B b') baker1
   in
diff --git a/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_preattestation.ml b/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_preattestation.ml
index 0ed039a499138efac197de56f4a60c03b9f98907..1d8343bec74ebb3f29ffac65ba562b08c6d2bd39 100644
--- a/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_preattestation.ml
+++ b/src/proto_alpha/lib_protocol/test/integration/consensus/test_double_preattestation.ml
@@ -48,8 +48,8 @@ end = struct
 
   let bake_n = Block.bake_n ~baking_mode:Mode.baking_mode
 
-  let bake_until_cycle_end =
-    Block.bake_until_cycle_end ~baking_mode:Mode.baking_mode
+  let bake_until_n_cycle_end =
+    Block.bake_until_n_cycle_end ~baking_mode:Mode.baking_mode
 
   (****************************************************************)
   (*                    Utility functions                         *)
@@ -143,8 +143,8 @@ end = struct
     let* bal_bad = Context.Delegate.full_balance (B bbad) d1 in
     let* () = Assert.equal_tez ~loc:__LOC__ bal_good bal_bad in
     (* Slashing happens at the end of the cycle. *)
-    let* bgood = bake_until_cycle_end ~policy:(By_account baker) bgood in
-    let* bbad = bake_until_cycle_end ~policy:(By_account baker) bbad in
+    let* bgood = bake_until_n_cycle_end ~policy:(By_account baker) 2 bgood in
+    let* bbad = bake_until_n_cycle_end ~policy:(By_account baker) 2 bbad in
     (* Checking what the attester lost *)
     let* frozen_deposit =
       Context.Delegate.current_frozen_deposits (B pred) d1
@@ -231,6 +231,7 @@ end = struct
         ~issuance_weights
         ~adaptive_issuance
         ~consensus_threshold:0
+        ~consensus_committee_size:64
         10
         ()
     in
diff --git a/src/proto_alpha/lib_protocol/test/integration/test_adaptive_issuance_roundtrip.ml b/src/proto_alpha/lib_protocol/test/integration/test_adaptive_issuance_roundtrip.ml
index 3390af28a1d44cf4ddff638b6202b7f2c21e3111..5d638863fab2efad818e2d75e284495c7a6de939 100644
--- a/src/proto_alpha/lib_protocol/test/integration/test_adaptive_issuance_roundtrip.ml
+++ b/src/proto_alpha/lib_protocol/test/integration/test_adaptive_issuance_roundtrip.ml
@@ -2561,7 +2561,7 @@ module Slashing = struct
                     else return_unit)
                --> check_snapshot_balances "before slash")
          --> exec_unit check_pending_slashings
-         --> next_block
+         --> next_cycle
         |+ Tag "denounce too late" --> next_cycle --> next_cycle
            --> assert_failure
                  ~expected_error:(fun (_block, state) ->
@@ -2884,12 +2884,14 @@ module Slashing = struct
              ["delegate"; "baker"])
     --> unstake "delegate" (Amount Tez.one_mutez)
     --> set_baker "baker" --> next_cycle
-    --> ((Tag "7% slash" --> double_bake "delegate" --> make_denunciations ()
-         |+ Tag "99% slash" --> next_cycle --> double_attest "delegate"
-            --> loop 7 (double_bake "delegate")
-            --> make_denunciations ())
-        --> next_cycle
-        --> check_balance_field "delegate" `Unstaked_frozen_total Tez.zero)
+    --> (Tag "5% slash" --> double_bake "delegate" --> make_denunciations ()
+        |+ Tag "95% slash" --> next_cycle --> double_attest "delegate"
+           --> loop 9 (double_bake "delegate")
+           --> make_denunciations ())
+    (* Wait two cycles because of ns_enable *)
+    --> next_cycle
+    --> next_cycle
+    --> check_balance_field "delegate" `Unstaked_frozen_total Tez.zero
     --> wait_n_cycles (constants.consensus_rights_delay + 1)
 
   let test_slash_rounding =
diff --git a/tezt/tests/adaptive_issuance.ml b/tezt/tests/adaptive_issuance.ml
index 19d8d03cef7f9d0e2e2ff2ca618dd7902ce3e61d..bfb5c5ab8d5f0e5caefa02ae49a77df933eb35c9 100644
--- a/tezt/tests/adaptive_issuance.ml
+++ b/tezt/tests/adaptive_issuance.ml
@@ -1082,6 +1082,15 @@ let test_staking =
     else Test.fail "Double baking evidence was not found"
   in
 
+  (* Bake a cycle to wait for the slashing *)
+  let* () =
+    Helpers.bake_n_cycles
+      bake
+      ~keys:[Constant.bootstrap1.public_key_hash]
+      1
+      client_1
+  in
+
   let* bu = Operation_receipt.get_block_metadata client_1 in
   let* bu = Operation_receipt.Balance_updates.from_result [bu] in
 
@@ -1323,7 +1332,7 @@ let test_staking =
   in
 
   assert (List.length finalizable == 0) ;
-  assert (List.length unfinalizable == 1) ;
+  assert (List.length unfinalizable == 0) ;
 
   let* balance2 = Client.get_balance_for ~account:staker0.alias client_1 in
   Log.info
diff --git a/tezt/tests/expected/RPC_test.ml/Alpha- (mode client) RPC regression tests- misc_protocol.out b/tezt/tests/expected/RPC_test.ml/Alpha- (mode client) RPC regression tests- misc_protocol.out
index 0f3ba89ec8716d258e68bd7d65c44cf9fefc781d..1d9060d2c4c89ece64b38bc9eca803c8f4844d57 100644
--- a/tezt/tests/expected/RPC_test.ml/Alpha- (mode client) RPC regression tests- misc_protocol.out	
+++ b/tezt/tests/expected/RPC_test.ml/Alpha- (mode client) RPC regression tests- misc_protocol.out	
@@ -76,7 +76,7 @@
       "radius_dz": { "numerator": "1", "denominator": "50" } },
   "adaptive_issuance_activation_vote_enable": true,
   "autostaking_enable": true, "adaptive_issuance_force_activation": false,
-  "ns_enable": false, "direct_ticket_spending_enable": false }
+  "ns_enable": true, "direct_ticket_spending_enable": false }
 
 ./octez-client rpc get /chains/main/blocks/head/helpers/baking_rights
 [ { "level": 2, "delegate": "[PUBLIC_KEY_HASH]",
diff --git a/tezt/tests/expected/RPC_test.ml/Alpha- (mode light) RPC regression tests- misc_protocol.out b/tezt/tests/expected/RPC_test.ml/Alpha- (mode light) RPC regression tests- misc_protocol.out
index aac8177c008a6cda7f816f9b602608e26c4a330a..e0ab02cc8c52fd40b1599b250e8a5e0d68823e9a 100644
--- a/tezt/tests/expected/RPC_test.ml/Alpha- (mode light) RPC regression tests- misc_protocol.out	
+++ b/tezt/tests/expected/RPC_test.ml/Alpha- (mode light) RPC regression tests- misc_protocol.out	
@@ -76,7 +76,7 @@
       "radius_dz": { "numerator": "1", "denominator": "50" } },
   "adaptive_issuance_activation_vote_enable": true,
   "autostaking_enable": true, "adaptive_issuance_force_activation": false,
-  "ns_enable": false, "direct_ticket_spending_enable": false }
+  "ns_enable": true, "direct_ticket_spending_enable": false }
 
 ./octez-client --mode light rpc get /chains/main/blocks/head/helpers/baking_rights
 [ { "level": 2, "delegate": "[PUBLIC_KEY_HASH]",
diff --git a/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy) RPC regression tests- misc_protocol.out b/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy) RPC regression tests- misc_protocol.out
index 2149eb2092eb6cc7b77a11f3ab09cf08bc353650..e0016303b2aa6cff1e4ed6f1a227b06333dc9aed 100644
--- a/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy) RPC regression tests- misc_protocol.out	
+++ b/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy) RPC regression tests- misc_protocol.out	
@@ -76,7 +76,7 @@
       "radius_dz": { "numerator": "1", "denominator": "50" } },
   "adaptive_issuance_activation_vote_enable": true,
   "autostaking_enable": true, "adaptive_issuance_force_activation": false,
-  "ns_enable": false, "direct_ticket_spending_enable": false }
+  "ns_enable": true, "direct_ticket_spending_enable": false }
 
 ./octez-client --mode proxy rpc get /chains/main/blocks/head/helpers/baking_rights
 [ { "level": 2, "delegate": "[PUBLIC_KEY_HASH]",
diff --git a/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy_server_data_dir) RPC regression tests- misc_protocol.out b/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy_server_data_dir) RPC regression tests- misc_protocol.out
index 3b39db3348d5c02fecd74e6ad7e93f7caac6bb46..4b95bc68d5c4c0f32e51869da26724ea68406edd 100644
--- a/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy_server_data_dir) RPC regression tests- misc_protocol.out	
+++ b/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy_server_data_dir) RPC regression tests- misc_protocol.out	
@@ -76,7 +76,7 @@
       "radius_dz": { "numerator": "1", "denominator": "50" } },
   "adaptive_issuance_activation_vote_enable": true,
   "autostaking_enable": true, "adaptive_issuance_force_activation": false,
-  "ns_enable": false, "direct_ticket_spending_enable": false }
+  "ns_enable": true, "direct_ticket_spending_enable": false }
 
 ./octez-client rpc get /chains/main/blocks/head/helpers/baking_rights
 [ { "level": 3, "delegate": "[PUBLIC_KEY_HASH]",
diff --git a/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy_server_rpc) RPC regression tests- misc_protocol.out b/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy_server_rpc) RPC regression tests- misc_protocol.out
index 3b39db3348d5c02fecd74e6ad7e93f7caac6bb46..4b95bc68d5c4c0f32e51869da26724ea68406edd 100644
--- a/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy_server_rpc) RPC regression tests- misc_protocol.out	
+++ b/tezt/tests/expected/RPC_test.ml/Alpha- (mode proxy_server_rpc) RPC regression tests- misc_protocol.out	
@@ -76,7 +76,7 @@
       "radius_dz": { "numerator": "1", "denominator": "50" } },
   "adaptive_issuance_activation_vote_enable": true,
   "autostaking_enable": true, "adaptive_issuance_force_activation": false,
-  "ns_enable": false, "direct_ticket_spending_enable": false }
+  "ns_enable": true, "direct_ticket_spending_enable": false }
 
 ./octez-client rpc get /chains/main/blocks/head/helpers/baking_rights
 [ { "level": 3, "delegate": "[PUBLIC_KEY_HASH]",